I'm awesome to see Caddy come so far. We started using Caddy a little over a year ago, when we needed a replacement for nginx as a reverse proxy that could talk directly to mesos to figure out routing. At the time I rewrote the reverse proxy middleware to get the functionality I needed, but we ended up maintaining our own fork (which is now widely behind), because we needed our own plugins (and a mesos reverse proxy didn't seem useful enough to integrate into caddy core), so its great to see first class support for plugins.
Thank you for your work on the proxy middleware, Nimi! Hopefully in the future we can get it to the point where you won't have to go to all the work to maintain a fork.
